Egypt unrest: Medical facilities set up in Tahrir Square

Egyptians are gathering in Cairo's Tahrir Square for a mass protest to put pressure on the military to speed up the transfer of power.

Violence broke out again in streets close to the square and a BBC correspondent there describes the situation as volatile.

Three days of clashes between security forces and protesters have left at least 28 dead and hundreds wounded.

Small field clinics have been set up around Tahrir Square to treat those injured. Doctors told the BBC's Lyce Doucet that hundreds had been treated in the square.